Activity : Think and Learn Directions: Match column A to column B. Write the letter of your answer in your notebook B a heart b. lungs It filters the oxygen that enters the body 2. The process of taking air into and expelling it from the lungs is called 3. These means to breathe in and to breathe out air into our lungs through our noses and mouth c. breathing 4. It is also known as the beat of the heart d. inhale/exhale 5. It pumps blood allowing the distribution of nutrients in all parts of the body e. pulse beat​